Jay Spearing's hamstring injury is the only blot on Liverpool's Carling Cup victory over Manchester City. The holding midfielder suffered a hamstring injury in the first half of Wednesday's game, and its severity is unknown, according to LiverpoolFC.tv.

Spearing appeared to pull his hamstring in the 23rd minute, with his team leading 1-0. He attempted a pass and quickly fell to the ground, clutching the back of his leg. Charlie Adam took his place in the midfield.

Manager Kenny Dalglish said the 23-year-old was suffering from a "tight" hamstring, suggesting the injury was not a pull or tear, which would keep him out for a lengthy period of time.

"It was his hamstring, but it wasn't too bad," Dalglish said. "It just went a bit tight on him. I don't think he has pulled anything, but we'll have to wait until the morning when he gets back [to Melwood]."

Spearing was just four games into his comeback, after serving a three-game ban in December. He was performing well in a deep-lying role, breaking up opponents' attacks and initiating LFC's forward moves.

He will have a scan on the area to determine the extent of the injury.